nds32: function_graph: Simplify with function_graph_enter()

The function_graph_enter() function does the work of calling the function
graph hook function and the management of the shadow stack, simplifying the
work done in the architecture dependent prepare_ftrace_return().

Have nds32 use the new code, and remove the shadow stack management as well as
having to set up the trace structure.

This is needed to prepare for a fix of a design bug on how the curr_ret_stack
is used.

Cc: Greentime Hu <greentime@andestech.com>
Cc: stable@kernel.org
Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index a0a9679..8a41372 100644 (file)
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -211,29 +211,15 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
                           unsigned long frame_pointer)
 {
        unsigned long return_hooker = (unsigned long)&return_to_handler;
-       struct ftrace_graph_ent trace;
        unsigned long old;
-       int err;
 
        if (unlikely(atomic_read(&current->tracing_graph_pause)))
                return;
 
        old = *parent;
 
-       trace.func = self_addr;
-       trace.depth = current->curr_ret_stack + 1;
-
-       /* Only trace if the calling function expects to */
-       if (!ftrace_graph_entry(&trace))
-               return;
-
-       err = ftrace_push_return_trace(old, self_addr, &trace.depth,
-                                      frame_pointer, NULL);
-
-       if (err == -EBUSY)
-               return;
-
-       *parent = return_hooker;
+       if (!function_graph_enter(old, self_addr, frame_pointer, NULL))
+               *parent = return_hooker;
 }
 
 noinline void ftrace_graph_caller(void)